| 1 | /* Copyright (C) 1991, 1995 Free Software Foundation, Inc.␍␊ |
| 2 | ␍␊ |
| 3 | This library is free software; you can redistribute it and/or modify ␍␊ |
| 4 | it under theterms of the GNU General Public License as published ␍␊ |
| 5 | by the Free Software Foundation; either version 2, or (at your option)␍␊ |
| 6 | any later version.␍␊ |
| 7 | ␍␊ |
| 8 | This library is distributed in the hope that it will be useful,␍␊ |
| 9 | but WITHOUT ANY WARRANTY; without even the implied warranty of␍␊ |
| 10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the␍␊ |
| 11 | GNU General Public License for more details.␍␊ |
| 12 | ␍␊ |
| 13 | You should have received a copy of the GNU General Public License␍␊ |
| 14 | along with GNU CC; see the file COPYING. If not, write to␍␊ |
| 15 | the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.␍␊ |
| 16 | ␍␊ |
| 17 | As a special exception, if you link this library with files␍␊ |
| 18 | compiled with a GNU compiler to produce an executable, this does not cause␍␊ |
| 19 | the resulting executable to be covered by the GNU General Public License.␍␊ |
| 20 | This exception does not however invalidate any other reasons why␍␊ |
| 21 | the executable file might be covered by the GNU General Public License. */␍␊ |
| 22 | ␍␊ |
| 23 | #include "libsa.h"␍␊ |
| 24 | ␍␊ |
| 25 | extern double atof ();␍␊ |
| 26 | ␍␊ |
| 27 | double strtod (nptr, enptr)␍␊ |
| 28 | ␉char *nptr;␍␊ |
| 29 | ␉char **enptr;␍␊ |
| 30 | {␍␊ |
| 31 | ␉char *p;␍␊ |
| 32 | ␍␊ |
| 33 | ␉if (enptr == (char **)0)␍␊ |
| 34 | ␉␉return atof (nptr);␍␊ |
| 35 | ␍␊ |
| 36 | ␉p = nptr;␍␊ |
| 37 | ␍␊ |
| 38 | ␉while (isspace (*p))␍␊ |
| 39 | ␉␉++p;␍␊ |
| 40 | ␍␊ |
| 41 | ␉if (*p == '+' || *p == '-')␍␊ |
| 42 | ␉␉++p;␍␊ |
| 43 | ␍␊ |
| 44 | ␉/* INF or INFINITY. */␍␊ |
| 45 | ␉if ((p[0] == 'i' || p[0] == 'I')␍␊ |
| 46 | ␉␉&& (p[1] == 'n' || p[1] == 'N')␍␊ |
| 47 | ␉␉&& (p[2] == 'f' || p[2] == 'F'))␍␊ |
| 48 | ␉{␍␊ |
| 49 | ␉␉if ((p[3] == 'i' || p[3] == 'I')␍␊ |
| 50 | ␉␉␉&& (p[4] == 'n' || p[4] == 'N')␍␊ |
| 51 | ␉␉␉&& (p[5] == 'i' || p[5] == 'I')␍␊ |
| 52 | ␉␉␉&& (p[6] == 't' || p[6] == 'T')␍␊ |
| 53 | ␉␉␉&& (p[7] == 'y' || p[7] == 'Y'))␍␊ |
| 54 | ␉␉{␍␊ |
| 55 | ␉␉␉*enptr = p + 7;␍␊ |
| 56 | ␉␉␉return atof (nptr);␍␊ |
| 57 | ␉␉}␍␊ |
| 58 | ␉␉else␍␊ |
| 59 | ␉␉{␍␊ |
| 60 | ␉␉␉*enptr = p + 3;␍␊ |
| 61 | ␉␉␉return atof (nptr);␍␊ |
| 62 | ␉␉}␍␊ |
| 63 | ␉}␍␊ |
| 64 | ␍␊ |
| 65 | ␉/* NAN or NAN(foo). */␍␊ |
| 66 | ␉if ((p[0] == 'n' || p[0] == 'N')␍␊ |
| 67 | ␉␉&& (p[1] == 'a' || p[1] == 'A')␍␊ |
| 68 | ␉␉&& (p[2] == 'n' || p[2] == 'N'))␍␊ |
| 69 | ␉{␍␊ |
| 70 | ␉␉p += 3;␍␊ |
| 71 | ␉␉if (*p == '(')␍␊ |
| 72 | ␉␉{␍␊ |
| 73 | ␉␉␉++p;␍␊ |
| 74 | ␉␉␉while (*p != '\0' && *p != ')')␍␊ |
| 75 | ␉␉␉␉++p;␍␊ |
| 76 | ␉␉␉if (*p == ')')␍␊ |
| 77 | ␉␉␉␉++p;␍␊ |
| 78 | ␉␉}␍␊ |
| 79 | ␉␉*enptr = p;␍␊ |
| 80 | ␉␉return atof (nptr);␍␊ |
| 81 | ␉}␍␊ |
| 82 | ␍␊ |
| 83 | ␉/* digits, with 0 or 1 periods in it. */␍␊ |
| 84 | ␉if (isdigit (*p) || *p == '.')␍␊ |
| 85 | ␉{␍␊ |
| 86 | ␉␉int got_dot = 0;␍␊ |
| 87 | ␉␉while (isdigit (*p) || (!got_dot && *p == '.'))␍␊ |
| 88 | ␉␉{␍␊ |
| 89 | ␉␉␉if (*p == '.')␍␊ |
| 90 | ␉␉␉␉got_dot = 1;␍␊ |
| 91 | ␉␉␉++p;␍␊ |
| 92 | ␉␉}␍␊ |
| 93 | ␍␊ |
| 94 | ␉␉/* Exponent. */␍␊ |
| 95 | ␉␉if (*p == 'e' || *p == 'E')␍␊ |
| 96 | ␉␉{␍␊ |
| 97 | ␉␉␉int i;␍␊ |
| 98 | ␉␉␉i = 1;␍␊ |
| 99 | ␉␉␉if (p[i] == '+' || p[i] == '-')␍␊ |
| 100 | ␉␉␉␉++i;␍␊ |
| 101 | ␉␉␉if (isdigit (p[i]))␍␊ |
| 102 | ␉␉␉{␍␊ |
| 103 | ␉␉␉␉while (isdigit (p[i]))␍␊ |
| 104 | ␉␉␉␉␉++i;␍␊ |
| 105 | ␉␉␉␉*enptr = p + i;␍␊ |
| 106 | ␉␉␉␉return atof (nptr);␍␊ |
| 107 | ␉␉␉}␍␊ |
| 108 | ␉␉}␍␊ |
| 109 | ␉␉*enptr = p;␍␊ |
| 110 | ␉␉return atof (nptr);␍␊ |
| 111 | ␉}␍␊ |
| 112 | ␉/* Didn't find any digits. Doesn't look like a number. */␍␊ |
| 113 | ␉*enptr = nptr;␍␊ |
| 114 | ␉return 0.0;␍␊ |
| 115 | }␍␊ |
| 116 | |
